May I ask........what do you mean with the "WK" ref ???95white35 said:Well of course its desinged to be done once a year, how else would Zebart make money??? When it comes to rustproofing, cured is just a fancy word for dry and means the same thing. ALL the Zebart treated cars I have seen had "rustproofing" laying at the bottom of the panels in flakes not doing crap. We use two diffrent kinds of WK brand stuff at the shop. The yellow wk never dries and is kick ass stuff, very very hard to get off the surface even after a number of years (very greasy) Along with the dark brown WK, which dries sorta hard, but still has an oily property. That stuff requires laquer thinner to remove it, and never flakes up. Boss said he has had that stuff in his scout II for 7 years now after the resto, and there isnt a spec of rust anywhere. When you take out a plug, or feel inside the fender its still the same as the new stuff, like it was just put in that very day. He drives it year round also. So from all the evidence I see, doing it one time and forgeting about it, when using the proper rustproofer isnt plane stupid.